/*
 * Copyright 2011 ArcBees Inc.
 * 
 * Licensed under the Apache License, Version 2.0 (the "License"); you may not
 * use this file except in compliance with the License. You may obtain a copy of
 * the License at
 * 
 * http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
 * License for the specific language governing permissions and limitations under
 * the License.
 */

package com.arcbees.test.collaborative.shared;

import com.google.gwt.user.client.Timer;

public abstract class AdaptativeTimer {

  private static final int delayIncrement = 500;
  private Timer timer;
  private int minDelay;
  private int maxDelay;
  private int currentDelay;

  /**
   * @param minDelay Milliseconds. Timer will default to this delay
   * @param maxDelay Milliseconds
   */
  public AdaptativeTimer(int minDelay, int maxDelay) {
    this.minDelay = minDelay;
    this.maxDelay = maxDelay;
    this.currentDelay = minDelay;

    this.timer = new Timer() {
      @Override
      public void run() {
        timerTick();
      }
    };
  }

  public abstract void timerTick();

  public void start() {
    setTimer();
  }

  public void cancel() {
    timer.cancel();
  }

  public void quicken() {
    if (currentDelay > minDelay) {
      currentDelay -= delayIncrement;
      if (currentDelay < minDelay) {
        currentDelay = minDelay;
      }
      setTimer();
    }
  }

  public void delay() {
    if (currentDelay < maxDelay) {
      currentDelay += delayIncrement;
      if (currentDelay > maxDelay) {
        currentDelay = maxDelay;
      }
      setTimer();
    }

  }

  private void setTimer() {
    timer.scheduleRepeating(currentDelay);
  }
}
